JP2007038438A - Method and device for cleaning printing plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cleaning method and a device applied to the method which sufficiently remove a useless thing from the plate surface of a printing plate, including even a part having intense indentations or the like, and make the surface free from another useless thing. <P>SOLUTION: An adhesive film 10 is wound on each of two laminating rolls (first roll 7 and second roll 6) provided on a frame. First the first roll 7 and then the second roll 6 are pressed against the plate surface of the printing plate 2, so as to stick the adhesive film 10 thereon, and thereby the useless thing is removed from the plate surface of the printing plate 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a cleaning method for cleaning a printing plate once printed to remove unnecessary materials, and an apparatus used for cleaning. More specifically, the present invention relates to a method and an apparatus for removing an unnecessary material from a plate surface by adhering an adhesive film to a plate surface of a printing plate to adhere an unnecessary material and peeling the adhesive film.

  Today, printing technology is used not only for printing characters on paper, but also for processing a great variety of products. For example, a color filter substrate for a liquid crystal display can be manufactured by printing three colors of red (R), green (G), and blue (B) corresponding to the three primary colors of light on a transparent glass substrate. is there.

  In addition, the printing methods are diversified. For example, a method called a reverse letterpress printing method is used for printing the above-described color filter. In this reverse letterpress printing method, first, a printing ink film having a uniform thickness is formed on a blanket. Next, this printing ink film is adhered to the printing plate. The printing plate is provided with irregularities with the image line portion as a concave portion and the non-image line portion as a convex portion, and the printing ink film in contact with the convex portion (non-image line portion) is transferred from the blanket to the printing plate. . Then, the blanket is pressed against, for example, a transparent glass substrate, and the printing ink film remaining in the image line portion is transferred and printed.

  In such a printing method, since the printing ink film remains on the convex portion of the printing plate after printing, it is necessary to remove this printing ink film before performing the next printing.

  Conventionally, such unnecessary materials include, for example, a method in which an organic solvent is sprayed to dissolve a printing ink film and scraped with a blade or doctor such as rubber, or ink dissolved in an organic solvent is wiped with a cloth or the like. It was used.

  However, in such a method, the printing ink is solidified by drying of the organic solvent, and on the other hand, particulate unnecessary substances may be generated. Moreover, when wiped off with a cloth, the fiber resulting from this cloth may adhere to the printing plate surface, generating unnecessary materials.

On the other hand, for example, a method has been proposed in which the printing ink and other unnecessary materials are removed from the pressure-sensitive adhesive surface of the film by adhering the pressure-sensitive adhesive film to a screen printing original plate and then removing it (Patent Document 1). reference). However, since the printing plate of the reverse letterpress printing method has irregularities on the surface, even if this method is applied, the pressure-sensitive adhesive film cannot follow a portion with severe irregularities or a portion having wide depressions. Could not be removed sufficiently.
Japanese Patent No. 3280367

  Accordingly, the present invention provides a cleaning method that eliminates unnecessary materials from the printing plate surface enough to reach a site with severe irregularities and the like, and a device applied to the method. It is intended to do.

That is, the invention according to claim 1 is a method of adhering an adhesive film to a plate surface of a printing plate and bonding and removing unnecessary materials on the plate surface to the adhesive film.
An adhesive film is wound around each of a plurality of rolls, and the plurality of rolls are pressed against the printing plate surface of the printing plate in order to adhere the adhesive film and move on the printing plate surface while rotating the plurality of rolls. Then, the printing plate cleaning method is characterized in that unnecessary materials on the plate surface are removed by adhesion.

  According to the first aspect of the present invention, the adhesive film wound between a plurality of rolls is sequentially adhered to the plate surface of the printing plate to remove the unnecessary material. It is removed as the adhesive film is peeled off. In addition, since the printing plate surface is pressed by the plurality of rolls, it is possible to sufficiently remove unnecessary materials up to a site with severe irregularities or a site with wide recesses.

Next, the invention according to claim 2 is a method of adhering an adhesive film to a plate surface of a printing plate and removing unnecessary materials on the plate surface by adhering to the adhesive film.
The used pressure-sensitive adhesive film is wound around the first roll, pressed against the plate surface of the printing plate to adhere the used pressure-sensitive adhesive film, and moved on the printing plate surface while rotating this roll, so that the plate surface is unnecessary. Remove the adhesive,
Next, the unused pressure-sensitive adhesive film is passed over a second roll, pressed against the plate surface of the printing plate to adhere the unused pressure-sensitive adhesive film, and moved on the printing plate surface while rotating this roll, The printing plate cleaning method is characterized in that the unnecessary material is removed by adhesion.

  According to the second aspect of the present invention, first, the used adhesive film is reused to clean the printing plate surface, and the unused adhesive film that has not been removed by the first cleaning is used. Therefore, it is possible to remove unnecessary substances more reliably.

  The invention according to claim 3 is the cleaning method according to claim 1 or 2, wherein the surface hardness of at least one of the plurality of rolls is 80 degrees or more.

  According to the third aspect of the present invention, since the surface hardness of the roll is 80 degrees or more, it is possible to reliably remove unnecessary materials even in a portion having a large unevenness or a portion having a wide recess.

Next, the invention described in claims 4 and 5 relates to an apparatus applied to the method of claims 1 to 3, that is, the invention described in claim 4 adheres an adhesive film to the plate surface of the printing plate. In an apparatus that removes unwanted material on the printing plate by adhering it to the adhesive film,
A plurality of rolls wound with an adhesive film, a pressing unit that sequentially presses the plurality of rolls against the plate surface of the printing plate to adhere the adhesive film, and a rotating unit that rotates the plurality of rolls. This is a printing plate cleaning device.

  The invention according to claim 5 is the cleaning apparatus according to claim 4, wherein the surface hardness of at least one of the plurality of rolls is 80 degrees or more.

  According to the present invention, unnecessary objects are sufficiently removed from the plate surface of the printing plate until reaching a site with severe irregularities, and new unnecessary objects are not generated.

  Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 of the drawings is an explanatory view showing a method of cleaning a printing plate surface using the apparatus of the present invention. In the figure, 2 indicates a printing plate, 3 indicates a standard plate for fixing the printing plate 2, and 1 indicates unnecessary materials such as printing ink attached to the plate surface of the printing plate 2.

  The cleaning apparatus according to the present invention has an unwinding roll 8 and a winding roll 9 mounted on a gantry (not shown), and an adhesive film 10 is wound around the unwinding roll 8. . The gantry includes a plurality of guide rolls and two bonding rolls (first roll 7 and second roll 6), and these rolls 7 and 6 are configured to be rotatable. In addition, these two bonding rolls (the first roll 7 and the second roll 6) are urged in an illustrated manner by an urging means (not shown). Moreover, the 1st peeling roll 5 and the 2nd peeling roll 4 are provided near these bonding rolls (the 1st roll 7 and the 2nd roll 6), respectively.

  The pressure-sensitive adhesive film 10 unwound from the unwinding roll 8 passes through the guide roll, first passes through the second peeling roll 4 and winds the second roll 6, and then winds the first roll 7. Turn. And it is wound up by the winding roll 9 via the first peeling roll 5.

  As will be described later, since the first roll 7 is first pressed against the plate surface of the printing plate 2 and then the second roll 6 is pressed, the adhesive film 10 at the site wound around the second roll 6 is not yet formed. On the other hand, the pressure-sensitive adhesive film 10 wound around the first roll 7 is a used film after being once adhered to the plate surface of the printing plate 2 by the second roll 6.

  Then, this gantry (not shown) is moved, and as shown in FIGS. 2 and 3, first, the first roll 7 is brought into contact with the plate surface of the printing plate and pressed by the urging means to adhere the adhesive film 10. Next, the first peeling roll 5 separates the plate from the plate surface. Then, the second roll 6 is brought into contact with the plate surface of the printing plate, pressed by the urging means to adhere the adhesive film 10, and then peeled off from the plate surface by the first peeling roll 5. At this time, each roll rotates with the movement of the gantry, and the adhesive film 10 travels from the unwinding roll 8 toward the winding roll 9 and is taken up by the winding roll 9. FIG. 4 shows a state after the printing plate surface has been cleaned in this manner. The unused adhesive film 10 is exposed on the first roll 7, and the second roll 6 is temporarily in the second state. The used film 10 after being adhered to the plate surface of the printing plate 2 by the roll 6 is exposed.

  FIG. 5 is an explanatory view showing another embodiment, in which two small rolls are used instead of the first roll 7 and two small rolls are used instead of the second roll 6.

  As the printing plate according to the present invention, for example, the above-mentioned printing plate applied to the reversal relief printing method can be exemplified as a representative one, but in addition, a printing plate for relief printing, a printing plate for intaglio printing, Also good. Further, the material may be a glass etched with copper and plated with chromium or the like, or glass.

  Moreover, the 1st roll and 2nd roll which concern on this invention may be comprised from arbitrary materials, for example, may be resin or metal. Examples of resins include polyester resins, alkyd resins, silicone resins, natural rubber, synthetic rubber, acrylic resins, epoxy resins, polyvinyl chloride resins, polyvinyl acetate resins, polyvinylidene chloride resins, and ethylene-vinyl acetate. Polymerized resin etc. can be illustrated. Examples of the metal include iron, copper, aluminum, and stainless steel. The first roll and the second roll desirably have a surface hardness of 80 degrees or more. When it is less than 80 degrees, it may not be able to be sufficiently cleaned at a portion having severe unevenness or a portion having a wide recess. In addition, the cross-sectional shape of these 1st rolls and 2nd rolls is not restricted to a circle, A triangle, a square, etc. may be sufficient.

Next, as an adhesive film, what applied the adhesive to the surface of the film-like base material can be utilized. There is no restriction | limiting in the material of a base material, For example, the woven fabric comprised from a natural fiber or a synthetic fiber, or a nonwoven fabric may be sufficient. Also, polyolefin resin, polyester resin, acrylic resin, styrene resin, polyamide resin, epoxy resin, urethane resin, phenol resin, polycarbonate resin, polyvinyl chloride resin, polyvinylidene chloride resin, polyacetic acid Vinyl resin, ethylene-vinyl acetate copolymer resin, fluorine-based resin, rubber and the like may be used.

  Examples of the pressure-sensitive adhesive include polyester-based pressure-sensitive adhesives, alkyd-based pressure-sensitive adhesives, silicone-based pressure-sensitive adhesives, rubber-based pressure-sensitive adhesives such as natural rubber and synthetic rubber, acrylic pressure-sensitive adhesives, epoxy-based pressure-sensitive adhesives, and vinyl-based pressure-sensitive adhesives. Etc. can be exemplified.

  In addition, as an adhesive film, what has a separator affixed on the adhesive application surface can also be used. In this case, the separator may be peeled and removed after unwinding from the unwinding roll.

In addition, it is desirable that the pressing force when adhering the adhesive film to the plate surface of the printing plate is 0.1 kgf / cm ² or more. In addition, when the unnecessary material does not sufficiently adhere to the pressure-sensitive adhesive film, either or both of the pressure-sensitive adhesive film and the plate surface can be activated before being bonded to the plate surface of the printing plate. . As the surface treatment, corona discharge treatment, ozone gas spraying treatment, or the like can be used.

  Moreover, it is desirable that the running speed, that is, the adhesion speed and the peeling speed of the pressure-sensitive adhesive film is 50 mm / second or more.

Explanatory drawing which shows the process of the cleaning method which concerns on embodiment of this invention. Explanatory drawing which shows the process of the cleaning method which concerns on embodiment of this invention. Explanatory drawing which shows the process of the cleaning method which concerns on embodiment of this invention. Explanatory drawing which shows the process of the cleaning method which concerns on embodiment of this invention. Explanatory drawing which shows the washing | cleaning method which concerns on other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1. Unnecessary thing 2. Printing plate light source 4. Second peeling roll 5. First peeling roll 6. Second roll 7. First roll 8. Unwinding roll 9. Winding roll

Claims (5)

In the method of adhering the adhesive film to the plate surface of the printing plate and bonding and removing unnecessary materials on the plate surface to the adhesive film,
An adhesive film is wound around each of a plurality of rolls, and the plurality of rolls are pressed against the printing plate surface of the printing plate in order to adhere the adhesive film and move on the printing plate surface while rotating the plurality of rolls. A method for cleaning a printing plate, characterized in that unnecessary substances on the plate surface are removed by adhesion. In the method of adhering the adhesive film to the plate surface of the printing plate and bonding and removing unnecessary materials on the plate surface to the adhesive film,
The used pressure-sensitive adhesive film is wound around the first roll, pressed against the plate surface of the printing plate to adhere the used pressure-sensitive adhesive film, and moved on the printing plate surface while rotating this roll, so that the plate surface is unnecessary. Remove the adhesive,
Next, the unused pressure-sensitive adhesive film is passed over a second roll, pressed against the plate surface of the printing plate to adhere the unused pressure-sensitive adhesive film, and moved on the printing plate surface while rotating this roll, A method for cleaning a printing plate, comprising: removing unnecessary materials by bonding.   The cleaning method according to claim 1 or 2, wherein at least one of the plurality of rolls has a surface hardness of 80 degrees or more. In an apparatus that adheres an adhesive film to the plate surface of a printing plate and adheres and removes unwanted material on the plate surface to the adhesive film,
A plurality of rolls wound with an adhesive film, a pressing unit that sequentially presses the plurality of rolls against the plate surface of the printing plate to adhere the adhesive film, and a rotating unit that rotates the plurality of rolls. A printing plate cleaning device.   The cleaning apparatus according to claim 4, wherein a surface hardness of at least one of the plurality of rolls is 80 degrees or more.

Images